McKee, who founded the older people’s lifestyle organisation Evermore, said she believed that making self-employment easier for disabled people could help the government with its aim to halve the disability employment gap.

She said: “People want choice and control over how they live their lives. You can’t always do your best work in some organisations and institutions.

“I earn currently probably a tenth of what I could earn, but my quality of life is better.”

She said she had been forced to make many “sideways moves” in her career because of being deaf, and eventually decided that self-employment would provide “greater autonomy and self-respect”.

But she added: “It’s a high-risk strategy because of the massive decline in income. I think it was an 80 per cent decline in the first year.”

McKee, who has a mental health condition, said it was easier for her to run her own business than to sit in a job interview and admit that she might be forced to take days off sick because of being unable to get out of bed.

She said she believed there needed to be a “safety net” so that disabled people like herself with fluctuating conditions could “come in and out of the workplace”.

She said: “At the moment there is no safety net. If I can’t go and do what I’m good at, there is no safety net. That loses an awful lot of talent from the marketplace.”

Cordell and Winstanley both pointed to flaws in the government’s Access to Work (AtW) scheme.

Winstanley, who runs his own business alongside having a part-time job, said it had taken 18 months to put his AtW package in place, but after just 12 months he was told by AtW that his business should now be sustainable so he should be able to fund his own support.

Cordell said she believed the government should secure the data that would demonstrate the value of AtW spending.

She said: “I want to know why and how my ability to contribute may be capped, and my ability to be one of the few senior deaf role models, inspiring others.”

She said that self-employment was “a fantastic route if you have the right determination, confidence and experience, but particularly if you have a sensory impairment or quite significant impairment you need to feel you have a fighting chance of getting the right support”.

Winstanley told the committee about flaws in the employment and support allowance (ESA) system, for those on out-of-work disability benefits.

Because of his condition, brittle bones, he never knows when he might be seriously injured and need to spend eight or nine months in bed recovering.

But if a disabled person leaves ESA to return to work, they have just 12 weeks to see if they can manage in employment, he said.

He told the committee: “After that 12 weeks, you have to go back through the process.”

This limit caused him problems because when he became injured and had to leave work, he had to restart the ESA application process from the beginning.

He said the ESA system was too “black and white”, and added: “You either are [eligible for ESA] or you’re not. There is no form of middle ground.”